1 files changed, 50 insertions, 0 deletions
diff --git a/user/progS.c b/user/progS.c
new file mode 100644
index 0000000..d220955
--- /dev/null
+++ b/user/progS.c
@@ -0,0 +1,50 @@
+#include <common.h>
+
+/**
+** User function S:   exit, sleep, write
+**
+** Reports itself, then loops forever, sleeping on each iteration
+**
+** Invoked as:  userS  x  [ s ]
+**	 where x is the ID character
+**		   s is the sleep time (defaults to 20)
+*/
+
+USERMAIN( main ) {
+	char ch = 's';	  // default character to print
+	int nap = 20;	  // nap time
+	char buf[128];
+
+	// process the command-line arguments
+	switch( argc ) {
+	case 3:	nap = str2int( argv[2], 10 );
+			// FALL THROUGH
+	case 2:	ch = argv[1][0];
+			break;
+	default:
+			sprint( buf, "userS: argc %d, args: ", argc );
+			cwrites( buf );
+			for( int i = 0; i <= argc; ++i ) {
+				sprint( buf, " %s", argv[argc] ? argv[argc] : "(null)" );
+				cwrites( buf );
+			}
+			cwrites( "\n" );
+	}
+
+	// announce our presence
+	write( CHAN_SIO, &ch, 1 );
+
+	sprint( buf, "userS sleeping %d(%d)\n", nap, SEC_TO_MS(nap) );
+	cwrites( buf );
+
+	for(;;) {
+		sleep( SEC_TO_MS(nap) );
+		write( CHAN_SIO, &ch, 1 );
+	}
+
+	sprint( buf, "!! %c exiting!?!?!?\n", ch );
+	cwrites( buf );
+	exit( 1 );
+
+	return( 42 );  // shut the compiler up!
+}